Question

a stone dropped a roof of a building takes 4s to reach the ground, find the height of the building.

Answer 1

Answer:

80 m

Explanation:

Use the formula S = ut + 0.5gt²

Answer 2

For t = 4 this distance is equal to the height h of the building,

so h = d(4 s) = 9.8 ∗ 42 2 = 9.8 ∗

16 2 = 9.8 ∗

8 = 78.4 m. Answer.